fix: Docker build SQLx offline mode and code improvements

- Update SQLx query cache with missing deployment queries
- Fix unused imports in deployment handlers and kubernetes service
- Add .dockerignore to reduce build context size
- Remove unused variables and clean up code warnings
- Ensure Docker build works with offline SQLx mode
- Add comprehensive API documentation with interactive examples

Author: secus

.sqlx/query-055295ddcc768b57f0919294344737ecde6dfd594903e7419594ef906477b026.json

@@ -48,8 +48,8 @@ else \
     echo "Building with offline mode"; \
     SQLX_OFFLINE=true cargo build --release --verbose; \
 fi
-    
-    # Final stage - Runtime (use Ubuntu 24.04 for newer GLIBC)
+
+# Final stage - Runtime (use Ubuntu 24.04 for newer GLIBC)
 FROM ubuntu:24.04
 
 # Install runtime dependencies